John Chrysostom
Since the Apostle had said many great things and had set himself and all the faithful above Moses, see how, fully aware of the force and weight of what was said, he again moderates his speech.
Indeed, he had to exalt himself because of the false apostles, and also his hearers. Yet he also had to moderate this height to which he had raised himself, without renouncing it completely. To renounce it would have been mere jesting.
For this reason he uses such a turn of speech as shows that everything depends not on his own perfections, but on God's love for mankind. Therefore he says, "having such a ministry."
"We have contributed nothing of our own," he says. "We were only God's servants and executors of the instructions given by Him."
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This is why he calls his apostolic work not rule or leadership, but only "ministry." Even with this he is not content, but adds, "by God's mercy."
That is, "even the very fact that we have been appointed ministers depends only on God's mercy and love for mankind."
True, mercy delivers from evils, rather than bestowing such blessings as were given to the Apostles. Yet this too belongs to God's mercy.
"We do not lose heart," that is, "even the fact that we do not grow despondent must be ascribed to His love for mankind."
The phrase "by God's mercy" must be referred both to the ministry and to the words "we do not lose heart."
See how he strives to soften what he had said about himself before. He says that one deemed worthy of such great and many blessings, and deemed worthy only by mercy and love for mankind, does nothing great, however much he labors.
Nor does he do anything great whatever dangers he undergoes, or whatever temptations he endures.